function f() {
    var t=100;
    var f=15;
    for (var i=7;i>0;i--){
        document.write("<hr width="+t+"%/>");
        t-=15;
    }
    for (var i=0;i<7;i++){
        document.write("<hr width="+f+"%/>");
        f+=15;
    }
}
this.f();
